CA2416314C - Protection de disques optiques contre la copie - Google Patents

Protection de disques optiques contre la copie Download PDF

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Publication number
CA2416314C
CA2416314C CA2416314A CA2416314A CA2416314C CA 2416314 C CA2416314 C CA 2416314C CA 2416314 A CA2416314 A CA 2416314A CA 2416314 A CA2416314 A CA 2416314A CA 2416314 C CA2416314 C CA 2416314C
Authority
CA
Canada
Prior art keywords
data patterns
data
disc
dsv
patterns
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
CA2416314A
Other languages
English (en)
Other versions
CA2416314A1 (fr
Inventor
Richard A. A. Heylen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rovi Europe Ltd
Original Assignee
Rovi Europe Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GB0018577A external-priority patent/GB0018577D0/en
Priority claimed from GB0019970A external-priority patent/GB0019970D0/en
Application filed by Rovi Europe Ltd filed Critical Rovi Europe Ltd
Publication of CA2416314A1 publication Critical patent/CA2416314A1/fr
Application granted granted Critical
Publication of CA2416314C publication Critical patent/CA2416314C/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/00572—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which change the format of the recording medium
    • G11B20/00579—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which change the format of the recording medium said format change concerning the data encoding, e.g., modulation schemes violating run-length constraints, causing excessive DC content, or involving uncommon codewords or sync patterns
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/0092—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which are linked to media defects or read/write errors
    • G11B20/00927—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which are linked to media defects or read/write errors wherein said defects or errors are generated on purpose, e.g. intended scratches
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/14—Digital recording or reproducing using self-clocking codes
    • G11B20/1403—Digital recording or reproducing using self-clocking codes characterised by the use of two levels
    • G11B20/1423—Code representation depending on subsequent bits, e.g. delay modulation, double density code, Miller code
    • G11B20/1426—Code representation depending on subsequent bits, e.g. delay modulation, double density code, Miller code conversion to or from block codes or representations thereof
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/14—Digital recording or reproducing using self-clocking codes
    • G11B20/1403—Digital recording or reproducing using self-clocking codes characterised by the use of two levels
    • G11B20/1423—Code representation depending on subsequent bits, e.g. delay modulation, double density code, Miller code
    • G11B20/1426—Code representation depending on subsequent bits, e.g. delay modulation, double density code, Miller code conversion to or from block codes or representations thereof
    • G11B2020/1457—Code representation depending on subsequent bits, e.g. delay modulation, double density code, Miller code conversion to or from block codes or representations thereof wherein DC control is performed by calculating a digital sum value [DSV]
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/14—Digital recording or reproducing using self-clocking codes
    • G11B20/1403—Digital recording or reproducing using self-clocking codes characterised by the use of two levels
    • G11B20/1423—Code representation depending on subsequent bits, e.g. delay modulation, double density code, Miller code
    • G11B20/1426—Code representation depending on subsequent bits, e.g. delay modulation, double density code, Miller code conversion to or from block codes or representations thereof
    • G11B2020/1469—Code representation depending on subsequent bits, e.g. delay modulation, double density code, Miller code conversion to or from block codes or representations thereof modulation code with one or more merging bits between consecutive codewords
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
    • G11B7/261—Preparing a master, e.g. exposing photoresist, electroforming

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

La présente invention concerne un procédé de protection de disques optiques contre la copie utilisant les différences de possibilités entre le codeur associé à un enregistreur à faisceau laser et celui des graveurs de CD actuellement disponibles. La DSV, c'est-à-dire la valeur de somme numérique (Digital Sum Value) est une propriété des données codées sur les CD, et, afin de conserver de bonnes caractéristiques DSV, le codeur a souvent un choix de bits de fusion à insérer entre les symboles qui véhiculent les données. Un codeur, qui commande un enregistreur à faisceau laser peut être capable de choisir une configuration de bits de fusion qui font que la DSV d'ensemble présente des propriétés optimales. Pendant la réalisation de la matrice d'un CD, des configurations de données sont ajoutées au disque pour fournir une signature authentifiante. Ces configurations de données sont choisies pour provoquer des problèmes de DSV. Toutefois, le codeur de l'enregistreur à faisceau laser est capable d'écrire avec exactitude la signature authentifiante sur la matrice. Lorsqu'on se sert d'un graveur de CD pour faire une copie d'un disque original, il est pourvu de données utilisateur provenant du disque, mais comme ces données utilisateur sont le produit du décodage, l'information concernant la configuration des bits de fusion aura été supprimée. Les graveurs de CD actuellement disponible s'avèrent avoir de la difficulté à écrire une signature authentifiante du type décrit sans produire un CD résultant affecté de graves problèmes de lisibilité. Ainsi, le disque de copie gravé par le graveur de CD aboutira à ce qu'un lecteur de CD renverra des données dégradées ou une information signalant une erreur de lecture.
CA2416314A 2000-07-28 2001-07-26 Protection de disques optiques contre la copie Expired - Lifetime CA2416314C (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
GB0018577A GB0018577D0 (en) 2000-07-28 2000-07-28 Copy protection for optical discs
GB0018577.7 2000-07-28
GB0019970A GB0019970D0 (en) 2000-08-14 2000-08-14 Copy protection for optical discs
GB0019970.3 2000-08-14
PCT/GB2001/003364 WO2002011136A1 (fr) 2000-07-28 2001-07-26 Protection de disques optiques contre la copie

Publications (2)

Publication Number Publication Date
CA2416314A1 CA2416314A1 (fr) 2002-02-07
CA2416314C true CA2416314C (fr) 2011-09-06

Family

ID=26244748

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2416314A Expired - Lifetime CA2416314C (fr) 2000-07-28 2001-07-26 Protection de disques optiques contre la copie

Country Status (16)

Country Link
US (1) US7464411B2 (fr)
EP (2) EP1305799A1 (fr)
JP (1) JP2004505403A (fr)
KR (1) KR20030020404A (fr)
CN (1) CN1273982C (fr)
AT (1) ATE371931T1 (fr)
AU (2) AU2001275709B2 (fr)
BR (1) BR0112805A (fr)
CA (1) CA2416314C (fr)
DE (1) DE60130275T2 (fr)
GB (1) GB2369718B (fr)
MX (1) MXPA03000851A (fr)
NZ (1) NZ523625A (fr)
PL (1) PL363776A1 (fr)
RU (1) RU2280906C2 (fr)
WO (1) WO2002011136A1 (fr)

Families Citing this family (46)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2001275709B2 (en) 2000-07-28 2006-11-09 Rovi Europe Limited Copy protection for optical discs
GB0304015D0 (en) * 2003-02-21 2003-03-26 Macrovision Europ Ltd Copy protection for applications
GB0124723D0 (en) * 2001-10-15 2001-12-05 Macrovision Corp Improvements in or relating to the copy protection of optical discs
WO2003079349A2 (fr) * 2002-03-14 2003-09-25 Cerberus Central Limited Ameliorations relatives a la securite dans la distribution de donnees numeriques
US6765739B2 (en) * 2002-03-18 2004-07-20 Hewlett-Packard Development Company, L.P. Method and apparatus for discouraging duplication of digital data
ATE468586T1 (de) * 2002-04-17 2010-06-15 Sony Dadc Austria Ag Kopierschutzsystem für optische platten
WO2003088242A1 (fr) * 2002-04-18 2003-10-23 Koninklijke Philips Electronics N.V. Procede de detection de copie et de protection au moyen de sauts temporels
JP2003323761A (ja) * 2002-05-02 2003-11-14 Sony Corp デジタルデータの記録媒体、記録方法、記録装置、再生方法、再生装置、送信方法および送信装置
JP4143330B2 (ja) * 2002-05-14 2008-09-03 ソニー株式会社 データ記録媒体、データ記録方法及び装置
DE60212838T2 (de) * 2002-09-04 2007-01-18 Sony Dadc Austria Ag Verfahren und Vorrichtung zur Herstellung von optischen Platten
EP1400964A1 (fr) * 2002-09-04 2004-03-24 Sony DADC Austria AG Procédé et dispositif de fabrication d'un disque optique
EP1429327A3 (fr) * 2002-12-13 2005-03-09 Sony DADC Austria AG Méthode et support d'enregistrement de données
GB0301700D0 (en) 2003-01-24 2003-02-26 Macrovision Corp The copy protection of optical discs
FR2850512B1 (fr) * 2003-01-28 2005-03-11 Medialive Procede et systeme automatiques et adaptatifs d'analyse et d'embrouillage pour des flux video numeriques
JP2004296049A (ja) * 2003-02-10 2004-10-21 Sony Corp データ記録方法および装置、データ記録媒体並びにデータ再生方法および装置
ES2379551T3 (es) * 2003-02-20 2012-04-27 Koninklijke Philips Electronics N.V. Soporte de información que comprende información de acceso
GB0304016D0 (en) * 2003-02-21 2003-03-26 Macrovision Europ Ltd The transmission of information
JP3960263B2 (ja) * 2003-05-21 2007-08-15 ソニー株式会社 データ記録方法
GB2402804B (en) 2003-06-13 2006-10-11 Macrovision Europ Ltd Copying copy protected optical discs
CN100353365C (zh) * 2003-06-25 2007-12-05 宇瞻科技股份有限公司 影音信息操作***
EP1914747A3 (fr) * 2003-10-31 2013-12-11 Sony DADC Austria AG Protection contre la copie de DVD
US7680277B2 (en) * 2003-11-12 2010-03-16 Microsoft Corporation Optical media protection methods and apparatuses
KR20070005563A (ko) 2004-01-19 2007-01-10 코닌클리케 필립스 일렉트로닉스 엔.브이. 보조 정보신호의 채널 데이터 스트림 내의 삽입
GB0403719D0 (en) 2004-02-19 2004-03-24 Macrovision Europ Ltd Improvements in or relating to the defeat of the copy protection of optical discs
US8059937B2 (en) * 2004-02-19 2011-11-15 Rovi Solutions Corporation Relating to the copy protection of optical discs
US7706661B2 (en) 2004-05-19 2010-04-27 Macrovision Corporation Copy protection of optical discs using redundant control data
GB2414337B (en) 2004-05-19 2008-10-29 Macrovision Europ Ltd The copy protection of optical discs
JP2006011682A (ja) * 2004-06-24 2006-01-12 Sony Corp 情報記録媒体検証装置、および情報記録媒体検証方法、並びにコンピュータ・プログラム
US7624282B2 (en) * 2004-10-12 2009-11-24 Macrovision Corporation Method and apparatus for DVD copy protection with selective data pattern insertion
US20060136729A1 (en) * 2004-12-20 2006-06-22 Macrovision Europe Limited Copy protection for optical discs
US20060253722A1 (en) * 2005-04-21 2006-11-09 Nielsen Hans H Uncopyable optical media through sector errors
US7701825B2 (en) 2005-06-17 2010-04-20 Macrovision Corporation Apparatus for and a method of authenticating recording media
WO2006136986A2 (fr) * 2005-06-21 2006-12-28 Koninklijke Philips Electronics N.V. Dispositif et procede pour integrer un signal d'informations secondaire au flux de donnees de canal d'un signal d'informations primaire, au moyen d'un embrouillage
JP4654806B2 (ja) * 2005-07-15 2011-03-23 ソニー株式会社 情報処理装置、情報記録媒体製造装置、情報記録媒体、および方法、並びにコンピュータ・プログラム
US8155315B2 (en) 2006-01-26 2012-04-10 Rovi Solutions Corporation Apparatus for and a method of downloading media content
EP2005368A4 (fr) * 2006-03-13 2010-11-10 Dtr Ltd Procede et systeme de protection de contenu numerique
US7609944B2 (en) * 2006-07-05 2009-10-27 Macrovision Corporation Copy protection of optical discs
US8254761B2 (en) 2007-03-07 2012-08-28 Rovi Solutions Corporation Copying digital content by emulating playing of a recording medium by a player
US8375461B2 (en) 2007-03-14 2013-02-12 Rovi Solutions Corporation Apparatus for and a method of copy-protecting a content carrying recording medium
US8930718B2 (en) 2007-03-28 2015-01-06 Rovi Solutions Corporation Apparatus for and a method of providing content data
US7755980B2 (en) * 2007-04-04 2010-07-13 Rovi Solutions Corporation Copy protection of optical discs
US20090031429A1 (en) * 2007-07-23 2009-01-29 Nir Ben Zeev Prevention of software and movie piracy
EP2186091A1 (fr) 2007-08-31 2010-05-19 Koninklijke Philips Electronics N.V. Disque optique comprenant un filigrane et procédé et dispositif d'enregistrement d'un tel disque
US8189998B2 (en) 2008-01-16 2012-05-29 Rovi Solutions Corporation Apparatus for and a method of copy-protecting a content carrying recording medium
WO2010113078A1 (fr) * 2009-03-31 2010-10-07 Koninklijke Philips Electronics N.V. Support de données, appareil de reproduction et appareil de fabrication
US9027092B2 (en) * 2009-10-23 2015-05-05 Novell, Inc. Techniques for securing data access

Family Cites Families (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8303859A (nl) * 1983-11-10 1985-06-03 Philips Nv Selektief scramblen bij compact disc.
JP2974678B2 (ja) * 1988-06-23 1999-11-10 ソニー株式会社 データ誤り検出方式
US5659613A (en) * 1994-06-29 1997-08-19 Macrovision Corporation Method and apparatus for copy protection for various recording media using a video finger print
WO1996005595A1 (fr) * 1994-08-08 1996-02-22 Sony Corporation Procede d'enregistrement de donnees, appareil d'enregistrement de donnees, support d'enregistrement sur disque, systeme informatique et procede destine a empecher la copie de donnees
CA2165532C (fr) * 1995-01-23 2005-10-04 Michael L. Mitchell Systeme pour coder une copie maitresse de verre pour la detection de contrefacons de cd-rom
KR0165441B1 (ko) * 1995-09-18 1999-03-20 김광호 디지털 데이터 채널 부호화 및 복호화방법과 그 장치
US5699434A (en) * 1995-12-12 1997-12-16 Hewlett-Packard Company Method of inhibiting copying of digital data
US6028936A (en) * 1996-01-16 2000-02-22 Disney Enterprises, Inc. Method and apparatus for authenticating recorded media
DE19628005B4 (de) 1996-07-11 2004-04-29 Sonopress Produktionsgesellschaft für Ton- und Informationsträger mbH System und Verfahren zur Bereitstellung von Daten für einen Laser-Beam-Recorder
JPH10106146A (ja) * 1996-09-25 1998-04-24 Victor Co Of Japan Ltd ディスクの記録再生方法及び再生装置
US5787068A (en) * 1996-11-07 1998-07-28 Imation Corp. Method and arrangement for preventing unauthorized duplication of optical discs using barriers
EP0854482B1 (fr) * 1997-01-16 2004-03-31 SGS-THOMSON MICROELECTRONICS S.r.l. Système et méthode de décodage des signaux modulés à EFM ou EFM-plus dans une unité de lecture de disques optiques (CD et DVD)
CA2261899C (fr) 1997-05-30 2007-11-13 C-Dilla Limited Procede visant a assurer une protection contre les copies d'un support d'enregistrement, support d'enregistrement protege contre les copies et moyen de detection des informations de commande d'acces
DE69706871T2 (de) 1997-10-21 2002-04-11 Hewlett-Packard Co. (N.D.Ges.D.Staates Delaware), Palo Alto Verfahren zur Verhinderung des Kopierens von digitalen Daten
US6317397B1 (en) * 1997-11-17 2001-11-13 Matsushita Electric Industrial Co., Ltd. Data recording medium, data recording apparatus, data reproducing apparatus and method
US6694023B1 (en) * 1997-12-29 2004-02-17 Samsung Electronics Co., Ltd. Method and apparatus for protecting copyright of digital recording medium and copyright protected digital recording medium
US6076165A (en) * 1998-01-16 2000-06-13 Sony Corporation Method for authenticating digital recording devices
EP0984346A1 (fr) * 1998-09-02 2000-03-08 Hitachi Europe Limited Méthode et dispositif de protection contre la copie
US6665240B1 (en) * 1998-10-07 2003-12-16 Sony Corporation Apparatus and method for manufacturing optical disks, apparatus and method for recording data on optical disks, apparatus and method for reproducing data from optical disks, and optical disk
EP1011103A1 (fr) 1998-12-08 2000-06-21 Metatec International B.V. Protection contre la copie de CD-ROM
US6966002B1 (en) * 1999-04-30 2005-11-15 Trymedia Systems, Inc. Methods and apparatus for secure distribution of software
GB9912312D0 (en) * 1999-05-26 1999-07-28 Dilla Limited C The copy protection of digital audio compact discs
GB0003531D0 (en) * 2000-02-15 2000-04-05 Dilla Limited C The copy protection of digital audio compact discs
AU2001275709B2 (en) 2000-07-28 2006-11-09 Rovi Europe Limited Copy protection for optical discs
JP2002175662A (ja) 2000-12-06 2002-06-21 Toshiba Emi Ltd 光ディスク
GB0304015D0 (en) 2003-02-21 2003-03-26 Macrovision Europ Ltd Copy protection for applications
JP3971635B2 (ja) 2002-04-08 2007-09-05 株式会社ソニー・ディスクアンドデジタルソリューションズ データ記録媒体、データ記録方法および装置
ATE468586T1 (de) 2002-04-17 2010-06-15 Sony Dadc Austria Ag Kopierschutzsystem für optische platten
JP2003323761A (ja) 2002-05-02 2003-11-14 Sony Corp デジタルデータの記録媒体、記録方法、記録装置、再生方法、再生装置、送信方法および送信装置
JP3863059B2 (ja) 2002-05-02 2006-12-27 ソニー株式会社 デジタルデータの記録媒体、記録方法、記録装置、再生方法、再生装置、送信方法および送信装置
JP4143330B2 (ja) 2002-05-14 2008-09-03 ソニー株式会社 データ記録媒体、データ記録方法及び装置
JP3671940B2 (ja) 2002-07-05 2005-07-13 ソニー株式会社 データ記録媒体、データ記録方法および装置
GB0301700D0 (en) 2003-01-24 2003-02-26 Macrovision Corp The copy protection of optical discs
GB0304016D0 (en) * 2003-02-21 2003-03-26 Macrovision Europ Ltd The transmission of information

Also Published As

Publication number Publication date
EP1524660A1 (fr) 2005-04-20
AU7570901A (en) 2002-02-13
EP1305799A1 (fr) 2003-05-02
PL363776A1 (en) 2004-11-29
NZ523625A (en) 2004-07-30
CN1466755A (zh) 2004-01-07
CA2416314A1 (fr) 2002-02-07
DE60130275T2 (de) 2008-05-21
GB0206606D0 (en) 2002-05-01
ATE371931T1 (de) 2007-09-15
RU2280906C2 (ru) 2006-07-27
US20020076046A1 (en) 2002-06-20
KR20030020404A (ko) 2003-03-08
DE60130275D1 (de) 2007-10-11
EP1524660B1 (fr) 2007-08-29
GB2369718B (en) 2004-08-04
JP2004505403A (ja) 2004-02-19
MXPA03000851A (es) 2004-12-13
GB2369718A (en) 2002-06-05
WO2002011136A1 (fr) 2002-02-07
US7464411B2 (en) 2008-12-09
CN1273982C (zh) 2006-09-06
AU2001275709B2 (en) 2006-11-09
BR0112805A (pt) 2003-07-01

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